Ventilator



Patented Nev. 11, 1931 CHARLES DAVIES, F NEW YORK, N. Y.

VENTILATOB Application ledvugust 15, 1929. Serial No. 386,043.

The general purpose of this invention is to provide an efficient and economical ventilator to supply dust free air for domestic and office use.

It is a further object of my invention to provide for small individual installations, a,

simple ventilator and air filter which may be easily operated, installed, and cleaned by any 1 member of the general public.

tem becomes clogged and dirty and requires cleaning or replacement at rather frequent intervals. It is, therefore, a further object of my invention to provide a long-lived filter o element which may also be removed and replaced with a' minimum of skill and effort. Tothis end I haveprovided a filter element and a mounting therefor which are easily de tached; but which,.in position, fully supports the filter element against the rather appreciable pressure I contemplate using.

Further obiects and advantages of my invention will becomevappar'ent from the description, to which I now proceed, of the preferred embodiment of my vinvention which is shown in the drawings, wherein:

Fig. 1 is a cross section in elevation of my ventilator applied to the window of a room.

Fig. 2 is a cross-sectional view in elevation showing the rear portion of the air flue, and the back frame slightly separated.

Fig. 3 is a front view of my ventilatonparts being broken away to show the interior.

Fig. 4 is an enlarged cross section of a portion of the filter element showing details of construction.

The form of my invention shown comprises a base board adapted Ato fit a window or similar opening in the wall of a building, an air flue leading from an opening in the base board, an air pump mounted in the opening andV designed to produce an appreciable air pressure in the flue, a corrugated filter member across the Hue, and quick detachable means for securing the filter member in place and having provision for supporting the individual corrugations against the air pressure.

In the drawings the numeral 1 designates the sill of the window and 2 the window sash.

The filter element in any air filtering sys.

The base board 3 is adapted to fit between the sill and the sash and cut off communication between the exterior and interior of the room except as provided by the circular opening 4 in the base board. The air impelling blades 5, which may be of any suitable design, are located in the opening 4 and may be driven by any suitable means such as the electric motor 6, which may be mounted on the eX- terior of the baseboard 3 by means of the arms 7 secured to the motor and to a metal reenforcing piece 8 vsecured to the base board and edging the opening 4. The motor may be protected from the weather bv means of a shield 9 mounted on the base board.

The opening 4 communicates with an air flue 10 which is secured to the back of the base board and extends into the interior of the room. The fiue may be rectangular in cross section and straight as shown; but any other form may be used. The filter element is placed across the flue to intercept and filter the air passing through the fiue. This element is corrugated or folded, to increase the filtering area, by means of a series of transverse folds 11a. The preferred filtering material is what is known as cellulose which c an be obtained in thin sheets of any desired size. i '80 To make my filter element I lay together a number of sheets of fcellulose to form the filter body 12; and enclose the latter between two shets 13, 13 of stiff reticulated material such as wire gauze. The whole is then folded transversely and bent to provide straight flanges 14, 14 at the periphery. The edges of the wire gauze sheets may then be secured together in any desired manner, thus providing a unitary filtering element which will afford ample protection to the fragile filtering material both in handling and when the element is in position and subject to the pressure of the air in the fiue.

At the back of the fiue 10 I provide a frame 15 comprising a flange 16 adapted to fit over the outside of the flue and be secured thereto by any suitable means such as the hooks and pins 17; and a flange 18 directed inward and at right angles to flange 16. Flange 18 is i to clamp and hold the Hanges l14, 14 of the filter. In order to secure the filter element against deformation and possible failure, Iv

have provided on the Hue and on the frame 1 5 means to support and further secure the vindividual folds of the filter clement. A sheet of wood or similar material 19 is mounted on each vertical interior face of the Hue and is provided with a serrated edge 2O adapted to conform to the corrugations of the filter element 11. A similar member 21 having a similar serrated edge 22 is mounted on each vertical interior face of the frame 15. The serrations 20 and 22 and the folds 11a'l interlock with each other when the parts are in posi-V tion so that each fold of the filter element is separately secured and supported.

Thus when it becomes necessary to replace the filter element, all that is required is to unhook the back frame 15. The old filter element may then be discarded, a new one placed on the support 20, the frame applied and hooked and the apparatus will then be in full operating condition.

To control the amount of air delivered b the motor a switch and rheostat (not showng7 may be placed on the outside of the Hue 10 or at any other convenient place.

In operation the fan or blower 5 will build up a considerable pressure in the Hue or-air box 10. The wire gauze 13, 13 on either side of the Hlter body 12 protects the latter not only from tearing under direct pressure but also against any sudden variation of the air pressure. The serrated edges 20 and 22 support each fold at the end and supply an element of vertical rigidityto the Hlter element which would otherwise be absent. As a result I obtain a filter element which Awill not readily give way under the conditions of operation, which will present a maximum of surface for filtering the air, and which is not too expensive in construction to discard when necessary.

Having thus described my invention, I

claim:

1. A ventilator and air filter comprising an air Hue adapted to receive air under pressure, an open frame at Vthe end of the Hue, an air filtering unit across the end of the Hue and adapted to be clamped between the Hue and the lframe, said filter unit being corunit across the end of the Hue and provided with a plurality of transverse corrugations, a frame adapted to fitv over the end of the Hue, and members carried by the Hue and the frame and cooperating with each other to hold and support the vindividual corrugations of the filter unit. 2

4. In combination, an air Hue, a filter unit across the Hue, said filter unit comprisin a body of fragile material held between reluforcing screens and shaped with a zigzag cross-section, a frame adapted to Ht the end of the Hue, and members on the Hue and on the frame provided with projections adapted to cooperate with each other to receive and support the zigzags of the filter unit.

CHARLES DAVIES.

rugated, and cooperating means on the Hue and the frame to hold and support the individual corrugations of the filter unit.

2. In combination, an air Hue adapted to receive air under pressure, an air filter unit across the end of the Hue and provided with a plurality of corrugations, a frame adapted to fit over the end ofthe Hue, and coo erating means on the Hue and on the frame a apted to clamp and hold in position each of the corrugations of the filter unit.

3. In combination, an air Hue, an air filter 

